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DWARF_GET_WEAKS(3) Library Functions Manual DWARF_GET_WEAKS(3)
NAMEdwarf_get_weaks, dwarf_weak_cu_offset, dwarf_weak_die_offset,
dwarf_weak_name_offsets, dwarf_weakname -- retrieve information about
weak symbols
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS#include<libdwarf.h>intdwarf_get_weaks(Dwarf_Debugdbg, Dwarf_Weak**weaks,
Dwarf_Signed*nweaks, Dwarf_Error*err);
intdwarf_weak_cu_offset(Dwarf_Weakweak, Dwarf_Off*cu_offset,
Dwarf_Error*err);
intdwarf_weak_die_offset(Dwarf_Weakweak, Dwarf_Off*die_offset,
Dwarf_Error*err);
intdwarf_weak_name_offsets(Dwarf_Weakweak, char**name,
Dwarf_Off*die_offset, Dwarf_Off*cu_die_offset, Dwarf_Error*err);
intdwarf_weakname(Dwarf_Weakweak, char**name, Dwarf_Error*err);
DESCRIPTION
These functions retrieve information about weak symbols from the lookup
tables in the (SGI-specific) ``.debug_weaknames'' section. Information
about weak symbols is returned using opaque descriptors of type
Dwarf_Weak. Applications need to use the functions described below to
retrieve the name and offset information contained in these descriptors.
Function dwarf_get_weaks() retrieves descriptors for all the weak symbols
associated with the DWARF debug context specified by argument dbg. The
argument weaks should point to a location that will be set to a pointer
to an array of Dwarf_Weak descriptors. The argument nweaks should point
to a location that will be set to the number of descriptors returned.
Function dwarf_weak_cu_offset() returns the offset, relative to the
``.debug_info'' section, of the compilation unit that contains the
debugging information entry associated with the argument weak. Argument
cu_offset should point to a location that will hold the returned offset.
Function dwarf_weak_die_offset() retrieves the offset, relative to the
``.debug_info'' section, of the debugging information entry associated
with the argument weak, and stores it into the location pointed to by the
argument die_offset.
Function dwarf_weak_name_offsets() retrieves the name and offsets for the
debugging information entry for argument weak. Argument name should
point to a location which will be set to a pointer to a NUL-terminated
string containing the name of the associated debugging information entry.
Argument die_offset should point to a location which will be set to the
offset, relative to the ``.debug_info'' section, of the associated
debugging information entry. Argument cu_die_offset should point to a
location which will be set to the offset, relative to the ``.debug_info''
section, of the first debugging information entry in the compilation unit
associated with argument weak.
Function dwarf_weakname() sets the location pointed to by argument name
to a pointer to a NUL-terminated string holding the name of the debugging
information entry associated with the argument weak.
MemoryManagement
The memory area used for the array of Dwarf_Weak descriptors returned in
argument weaks by function dwarf_get_weaks() is owned by the DWARF Access
Library (libdwarf, -ldwarf). Application code should not attempt to
directly free this pointer. Portable code should instead use the
function dwarf_weaks_dealloc(3) to indicate that the memory area may be
freed.
The memory area used for the string returned in the name argument to
functions dwarf_weak_name_offsets() and dwarf_weakname() is owned by the
DWARF Access Library (libdwarf, -ldwarf). Portable code should indicate
that the memory area can be freed using the dwarf_dealloc(3) function.
ErrorReturns
If argument err is not NULL, these functions will use it to store error
information, in case of an error.
RETURNVALUES
On success, these functions returns DW_DLV_OK. In case of an error, they
return DW_DLV_ERROR and set the argument err.
ERRORS
These functions may fail with the following errors:
[DW_DLE_ARGUMENT] One of the arguments cu_die_offset, cu_offset,
dbg, die_offset, weak, weaks, name, or nweaks was
NULL.
[DW_DLE_NO_ENTRY] The DWARF debugging context referenced by
argument dbg did not contain information about
weak symbols.
SEEALSOdwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3),
dwarf_weaks_dealloc(3)
NetBSD 7.1.2 April 10, 2011 NetBSD 7.1.2